[SYCL][CMake] Build RelWithDebInfo sycl runtimes with frame pointers (#17342)

Enable frame pointers on sycl runtimes when the build configuration is
Debug or RelWithDebInfo. (Though setting this will typically be a no-op
for Debug builds.)

Frame pointers improve the effectiveness of profilers, tracers, and
other introspection tools.

Author: tcreech-intel

sycl/source/CMakeLists.txt

@@ -42,6 +42,17 @@ function(add_sycl_rt_library LIB_NAME LIB_OBJ_NAME)
     target_compile_options(${LIB_NAME} PRIVATE ${CMAKE_CXX_FLAGS_DEBUG_SEPARATED})
   endif()
 
+  # To facilitate better tracing and profiling except on release builds.
+  check_cxx_compiler_flag("-fno-omit-frame-pointer" CXX_HAS_NO_OMIT_FRAME_POINTER)
+  if (CXX_HAS_NO_OMIT_FRAME_POINTER)
+    target_compile_options(${LIB_NAME} PUBLIC
+      $<$<CONFIG:Debug,RelWithDebInfo>:-fno-omit-frame-pointer>
+      )
+    target_compile_options(${LIB_OBJ_NAME} PUBLIC
+      $<$<CONFIG:Debug,RelWithDebInfo>:-fno-omit-frame-pointer>
+      )
+  endif()
+
   if (SYCL_ENABLE_COVERAGE)
     target_compile_options(${LIB_OBJ_NAME} PUBLIC
       -fprofile-instr-generate -fcoverage-mapping